The Last Signal - Printable Mystery (Free Playtest)

Greyhaven Observatory has gone silent. Decode the technician's message, rebuild a test log and follow the signal route to recover the four-digit restart PIN.

The Last Signal is a complete, short beginner mystery in English. This free playtest includes all three puzzles and the ending: no paid upgrade is needed to finish.

WHAT YOU GET

- A five-page player packet.

- A separate three-page host guide with graduated hints and full worked solutions.

- Both A4 and US Letter editions, plus a Start Here text file, in one ZIP download.

- Original story and graphics; clues work with black-and-white printing.

HOW TO PLAY

Intended for 1-4 players aged 12+. Print the player packet at Actual Size / 100%, or read it on a screen and use paper for notes. You need a pencil; no apps, cutting, locks or astronomy knowledge. Keep the host guide separate because it contains spoilers.

Allow roughly 10-20 minutes. This is an estimated playtime: this first edition has not yet had independent human playtests. The puzzle logic and PDF layouts have been checked.

FREE PLAYTEST

Enter 0 to download free, or choose an optional amount to support future PMC Labs puzzles. No payment is required. We'd welcome your completion time, player count, hints used and any unclear clues at pmclabs.studio@gmail.com (subject: The Last Signal - playtest feedback).

USE LICENCE

Personal play, one teacher's classroom and your organisation's internal team activities, including multiple groups. You may print copies for those activities. No resale, public file rehosting, attribution removal or use as a paid event product. Share this product link instead.

Digital download only. No physical product is shipped. By PMC Labs Studio: https://pmclabs.studio